JPH0427472U - - Google Patents
Info
- Publication number
- JPH0427472U JPH0427472U JP6883390U JP6883390U JPH0427472U JP H0427472 U JPH0427472 U JP H0427472U JP 6883390 U JP6883390 U JP 6883390U JP 6883390 U JP6883390 U JP 6883390U JP H0427472 U JPH0427472 U JP H0427472U
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- developing sleeve
- toner
- magnetic pole
- field generating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003746 surface roughness Effects 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Magnetic Brush Developing In Electrophotography (AREA)
Description
図面は本考案の実施例を示すもので、第１図は
要部断面図、第２図は原理を説明する一部拡大断
面図、第３図は他の実施例を示す要部断面図、第
４図は筒状現像スリーブの表面粗さを変えた場合
のトナー層厚とドクターギヤツプとの関係を示す
図である。
１……トナー供給手段、１ａ……磁性トナー、
３……筒状現像スリーブ、４……固定磁界発生手
段、４ａ……空隙、５，１５……ドクターブレー
ド手段、５ａ，５ｂ，１５ａ，１５ｂ……磁極板
。
The drawings show an embodiment of the present invention; FIG. 1 is a sectional view of the main part, FIG. 2 is a partially enlarged sectional view illustrating the principle, and FIG. 3 is a sectional view of the main part showing another embodiment. FIG. 4 is a diagram showing the relationship between the toner layer thickness and the doctor gap when the surface roughness of the cylindrical developing sleeve is changed. 1... Toner supply means, 1a... Magnetic toner,
3... Cylindrical developing sleeve, 4... Fixed magnetic field generating means, 4a... Air gap, 5, 15... Doctor blade means, 5a, 5b, 15a, 15b... Magnetic pole plate.
Claims (1)
に回転駆動される非磁性の筒状現像スリーブと、
上記現像スリーブ上に上記磁性トナーを供給する
トナー供給手段と、上記現像スリーブ内に配置し
てある固定磁界発生手段と、上記現像スリーブの
表面と対向的に配置してあり上記磁性トナーの層
厚を規制するドクターブレード手段とからなり、
このドクターブレード手段は、先端部が所定の間
隔をもつて異極に磁化されている１組の磁極板に
よつて構成してあり、 上記固定磁界発生手段には、当該固定磁界発生
手段からの磁束が実質的に上記磁極板に対し作用
しないように、上記磁極板と対向する領域に空隙
が形成してあり、 上記現像スリーブの表面粗さは８μｍ以下であ
る ことを特徴とする電子写真記録装置の現像器。[Claims for Utility Model Registration] A non-magnetic cylindrical developing sleeve that supports magnetic toner on its surface and is rotationally driven to transport the toner;
a toner supply means for supplying the magnetic toner onto the developing sleeve; a fixed magnetic field generating means disposed within the developing sleeve; and a layer thickness of the magnetic toner disposed facing the surface of the developing sleeve. and a doctor blade means for regulating the
This doctor blade means is constituted by a pair of magnetic pole plates whose tips are magnetized with different polarities with a predetermined interval, and the fixed magnetic field generating means is provided with a An electrophotographic record characterized in that a gap is formed in a region facing the magnetic pole plate so that magnetic flux does not substantially act on the magnetic pole plate, and the surface roughness of the developing sleeve is 8 μm or less. Developing unit of the device.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6883390U JPH0427472U (en) | 1990-06-28 | 1990-06-28 | |
| DE4112429A DE4112429A1 (en) | 1990-04-27 | 1991-04-16 | DEVELOPMENT DEVICE FOR AN ELECTROPHOTOGRAPHIC PRINTER |
| US07/686,640 US5072690A (en) | 1990-04-27 | 1991-04-17 | Developing device of electrophotographic printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6883390U JPH0427472U (en) | 1990-06-28 | 1990-06-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0427472U true JPH0427472U (en) | 1992-03-04 |
Family
ID=31603609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6883390U Pending JPH0427472U (en) | 1990-04-27 | 1990-06-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0427472U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5766455A (en) * | 1980-10-11 | 1982-04-22 | Canon Inc | Development device |
| JPH049987A (en) * | 1990-04-27 | 1992-01-14 | Seikosha Co Ltd | Developing device for electrophotographing recording device |
-
1990
- 1990-06-28 JP JP6883390U patent/JPH0427472U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5766455A (en) * | 1980-10-11 | 1982-04-22 | Canon Inc | Development device |
| JPH049987A (en) * | 1990-04-27 | 1992-01-14 | Seikosha Co Ltd | Developing device for electrophotographing recording device |
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